That's a little pop-out compartment to store stuff, it came with those cases.

Nice rig, I think the wires should be tidied up a little bit, but otherwise nice PC.

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Hi wtf8269. You are absolutely right. It is a small box to store the bolts and also my artic silver 5 thermal paste. It comes with the original Antec Super Lan Boy casing. And thanks for the comment about the wires. I will definitely try to make it looks better and less messy.